If the direction ratios of two lines are given by and

MATHEMATICS · Single correct · CBSE · Mathematics · Three-Dimensional Geometry · Three-Dimensional Geometry

Problem

If the direction ratios of two lines are given by

a + b + c = 0

and

2ab + 2ac - bc = 0

, then the angle between the lines is (1)

\pi

(2)

\frac{2\pi}{3}

(3)

\frac{\pi}{2}

(4)

\frac{\pi}{3}